LibWeb: Support individual scale CSS property

Author: https://github.com/awesomekling
Commit: 9a7c9286c4
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2506
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/Painting/PaintableBox.h

@@ -137,6 +137,8 @@ public:
             return true;
         if (computed_values().translate().has_value())
             return true;
+        if (computed_values().scale().has_value())
+            return true;
         return false;
     }